1 files changed, 5 insertions, 1 deletions
diff --git a/activerecord/lib/active_record/connection_adapters/type/decimal.rb b/activerecord/lib/active_record/connection_adapters/type/decimal.rb
index 9581cd5964..3a9c470dba 100644
--- a/activerecord/lib/active_record/connection_adapters/type/decimal.rb
+++ b/activerecord/lib/active_record/connection_adapters/type/decimal.rb
@@ -9,7 +9,11 @@ module ActiveRecord
         private
 
         def cast_value(value)
-          Column.value_to_decimal(value)
+          if value.respond_to?(:to_d)
+            value.to_d
+          else
+            value.to_s.to_d
+          end
         end
       end
     end